[PATCH 12/14] iomap: Inline data shouldn't see THPs

Matthew Wilcox (Oracle)
2020-10-14T09:23:27Z

Assert that we're not seeing THPs in functions that read/write
inline data, rather than zeroing out the tail.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
fs/iomap/buffered-io.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 38fd69ebd4cc..38b6b75e7639 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -247,6 +247,7 @@ iomap_read_inline_data(struct inode *inode, struct page *page,
return;

BUG_ON(page->index);
+ BUG_ON(PageCompound(page));
BUG_ON(size > PAGE_SIZE - offset_in_page(iomap->inline_data));

addr = kmap_atomic(page);
@@ -782,6 +783,7 @@ static size_t iomap_write_end_inline(struct inode *inode, struct page *page,
void *addr;

WARN_ON_ONCE(!PageUptodate(page));
+ BUG_ON(PageCompound(page));
BUG_ON(pos + copied > PAGE_SIZE - offset_in_page(iomap->inline_data));

flush_dcache_page(page);
--
2.28.0